Support extra user agent

[Cyb3r-Jak3]

Support adding extra infomation to the user-agent used

[codecov]

Codecov Report

❌ Patch coverage is 74.41860% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.86%. Comparing base (413e201) to head (8f37fb8).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
cmd/cloudflare-utils/prune-deployments.go	74.07%	5 Missing and 2 partials ⚠️
cmd/cloudflare-utils/main.go	70.00%	2 Missing and 1 partial ⚠️
cmd/cloudflare-utils/utils.go	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #256      +/-   ##
==========================================
- Coverage   70.20%   69.86%   -0.35%     
==========================================
  Files           9        9              
  Lines        1242     1261      +19     
==========================================
+ Hits          872      881       +9     
- Misses        279      286       +7     
- Partials       91       94       +3     

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[cloudflare-workers-and-pages]

Deploying cloudflare-utils with    Cloudflare Pages

Latest commit:	b060a15
Status:	✅  Deploy successful!
Preview URL:	https://3943036e.cloudflare-utils.pages.dev
Branch Preview URL:	https://support-extra-user-agent.cloudflare-utils.pages.dev

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